| Argentina (5) |
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| Baez, Sebastian | | Cachin, Pedro | | Cerundolo, Francisco | | Etcheverry, Tomas Martin | | Schwartzman, Diego |
| | Australia (5) |
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| De Minaur, Alex | | Kokkinakis, Thanasi | | Kubler, Jason | | O'Connell, Christopher | | Popyrin, Alexei |
| | Austria (2) |
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| Rodionov, Jurij | | Thiem, Dominic |
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| Ivashka, Ilya |
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| Dimitrov, Grigor |
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| Auger-Aliassime, Felix | | Shapovalov, Denis |
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| Garin, Christian | | Jarry, Nicolas |
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| Wu, Yibing | | Zhang, Zhizhen |
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| Galan, Daniel Elahi |
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| Coric, Borna | | Gojo, Borna |
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| Lehecka, Jiri |
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| Ruusuvuori, Emil |
| | Francia (10) |
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| Barrere, Gregoire | | Chardy, Jeremy | | Gasquet, Richard | | Gaston, Hugo | | Grenier, Hugo | | Halys, Quentin | | Humbert, Ugo | | Mannarino, Adrian | | Moutet, Corentin | | Paire, Benoit |
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| Germania (5) |
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| Altmaier, Daniel | | Hanfmann, Yannick | | Otte, Oscar | | Struff, Jan-Lennard | | Zverev, Alexander |
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| Russia (6) |
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| Karatsev, Aslan | | Khachanov, Karen | | Kotov, Pavel | | Medvedev, Daniil | | Rublev, Andrey | | Safiullin, Roman |
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| Djere, Laslo | | Kecmanovic, Miomir | | Krajinovic, Filip | | Lajovic, Dusan |
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| Molcan, Alex |
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| Edmund, Kyle | | Evans, Daniel | | Murray, Andy | | Norrie, Cameron |
| | Stati Uniti (10) |
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| Cressy, Maxime | | Fritz, Taylor | | Giron, Marcos | | Korda, Sebastian | | McDonald, Mackenzie | | Nava, Emilio | | Paul, Tommy | | Shelton, Ben | | Tiafoe, Frances | | Wolf, J.J. |
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